Research on Speed-Loop Control Strategy of Dynamic Load Simulators for Electric Vehicle Powertrain

摘要

The dynamic load simulators (DLS) for electric vehicle powertrain is a resonant system. Generally, it is difficult to guarantee the stability of the system and its dynamic performance needs to be improved. Besides, It is different from the traditional servo system, the external disturbance of DLS is the active motion of electric vehicle drive motor, and output is the load torque. To overcome the disturbance of surplus torque and the nonlinearity of motor which deteriorates the precision of load tracking, a speed control strategy for DLS is proposed. The proposed speed control strategy includes a closed-loop speed controller, a speed reference feedforward, load torque and a position feedforward. The system performances of disturbance rejection, robustness, and stability are analyzed. Theoretical analysis and experimental results show that the proposed method effectively suppresses the disturbance of surplus torque, improves the control precision, dynamic performance, stability, and robustness.